Variable speed unit



Nov. 28, 1939.

'Fl d 7; 1 v Ongmal 1 e June 2 933 2 sheets sheet 1 HAIR/22618566;FOSTER & ARR/6 Patented Nov. 28, 1939 2,181,567 VARIABL SPEED UNIT CarlE. Johnson, hall, Dos

Pasadena. and Earl Menden- Angeles, Calif.

Continuation of a ppllcation Serial No. 675,863,

June 2'7, 1933.

This application February 1938, Serial No. 191,442

15 Claims. (Cl. '74230.17)

This application is a continuation of our co-v pending application,Serial No. 677,863, filed June 2'7, 1933, entitled Variable speed uniOur invention relates to a novel variable speed system particularlyapplicable in conjunction with an electric motor whereby a newcombination of elements is utilized in changing the speed ratios betweena drive shaft and a driven shaft.

'The. change in speeds possible with existing variable speed structureis relatively limited, seldom being more than 8 to l. A larger speedratio is desirable in many installations, and the present invention hasfor one of its objects the provision of a novel system utilizing twovariable speed units operatively connected together in a novel manner.so that speed ratios as highas 100 to 1 may be secured.

The invention is applicable to various types of variable speed systems,but in the preferred embodiment we prefer to utilize the type ofvariable speed unit including a V-belt or its equivalent in conjunctionwith one or more variable diameter pulley means, preferably of the typeincluding a pair of flange members which can be moved toward and awayfrom each other. In existing structures these flanges are moved towardand away from each other by a spring, this spring being compressed asthe belt is drawn inward toward the axis of rotation, thus permittingthe flanges to be resiliently moved away from each other. flhis systemis open to serious limitations, especially in high-torque equipment. Onefundamental defect thereof is that thebelt tends to creep toward theaxis of rotation of the shaft when the torque is suddenly increased,thus result ing in unequal speeds, a loosening of the belt,

and unstable operation.

It is an object of the present invention to mechanically interconnectthe flange members of such a pulley by an adjustment means, utilizingother means for compensating for thechange in position of the belt as itmoves inward and outward between these flange members as the speed isbeing changed.

Another object of the present'invention is to provide two sets of suchmechanically interconnected flange members, one set being on the driveshaft and the other being on the. driven shaft, together with ,acontrolmeans which'simultaneously adjusts both sets. axes of the shaftscan be fixed in position, thus eliminating any resilient meansheretofore necessary in moving one shaft relative to the other tocompensate for change in conditions as the belt moves toward and awayfrom the axis of rotationship between the With such a system the tion.Other features of the invention lie in the details of this system,panying drawings. r

It is often desirable to utilize one pulley means of larger diameterthan the other. With such a system it has been found desirable to movethe adjustment means of each pulley simultaneously,

but at different rates, and this feature constitutes an important detailof the present invention.

It is also desirable to provide a system wherein the belt can betightened, and a feature of the present invention lies in the structurefor accomplishing this end by changing the relationship between thecontrol means and the adjustment means.

Still novel relationship other features of the invention lie in thebetween the motor'and the speed-control unit involving a novel placementof the motor and a novel circulation of cooling medium, as well as astructure which is readily adapted to standardization of parts.

Another object of the invention is to provide such a variable speedsystem in which the belt can be replaced without dismantling thestructure.

Another object of the invention is to provide a illustrated in theaccomnovel variable speed system which is capable of operating hightorque loads, this being accomplished by dividing the speed-controlmeans into two units, one unit being capable of transmitting a highertorque than the other.

An addditional feature is to provide a movable countershaft capable ofcontrolling the tension in the belts of such a two-unit system.

Other objects and advantages of the invention lie in the particularstructures disclosed, as well as in the more general combinations to behereinafter described.

Referring particularly to the drawings:

Fig. 1 is a top view showing in general the rela parts of my systemwhich permits the obtaining of relatively high speed ratios. 1

Fig. 2 is a, horizontal view partially in section, illustrating indetail one of the units disclosed in Fig. 1, and more particularly theunit to which the motor is directly connected.

Fig. 3 is a vertical sectional view taken along the line 3-3 of Fig. 2.

Fig. 4 is a sectional view illustrating the tension adjusting means.

Figs. 5, 6, and '7 are sectional views of an alternative form of theinvention, Fig. 6 being taken along the line 6-6 of Fig. 5, and Fig. '7being taken along the line I-'| of Fig. 6.

,cess 24 formed in the Referring particularly to Fig. 2, we have shown anovel sub-combination of the invention comprising a motor unit,indicated in general by the numeral I5, including a transmission unit,indicated by the numeral l6, and an electric motor, indicated by thenumeral l1.

This transmission unit I6 is shown as including an enclosing shell l9defining a transmission chamber 20. This shell is of novel construction,including side walls 2| and 22, there being a reside 2| by an annularwall 25 extending into the transmission chamber 20 and terminating in aflange 26. Extending across this flange is a plate 21 which forms an endbell of the motor 11. This motor may be of conventional constructionincluding a stator 28 anda rotor 29 enclosed in a motor casing 30. Theexternal diameter of the motor casing is smaller than the internaldiameter of the wall 25 to define an annular space 32 therebetween whichcommunicates with the atmosphere. The outer end of this motor shell maybe closed by an end bell 33 providing a suitable opening through whichair may be drawn by a means such as a fan 34 secured to a shaft 35 onwhich the rotor is mounted and hereinafter termed a drive shaft. Thisfan circulates the air or other cooling medium through the motor incooling relationship with its parts. In the form of motor shown thiscirculation is indicated by arrows 36 and takes place around the stator28 in an annular space defined between this stator and the motor casing30. This cooling medium then moves through the annular space 32 and isdischarged therefrom as indicated by arrows 38.

It is desirable to detachably connect the motor n the recess 24 in theform of the invention shown. This is accomplished by the use of bolts 40extending through the flange 26 and into a flange 4| formed on the plate21. The plate 21 and its flange 4| are suitably secured to the motorcasing 30 by means of an annular shoulder 42. Openings 43 are formed atintervals around this annular shoulder to permit circulation of thecooling medium, as indicated by the arrows 36 and 38.

This structure is particularly valuable in that it prevents the mediumcirculating through the motor from entering the transmission chamber Ifthe circulation were permitted to take place through this chamber, thebelt means would be detrimentally affected by the heat conditions in themotor. In addition, thecooling medium often carries suspended dust orother foreign would be deposited on the working parts in thetransmission chamber 11' the circulation took place therethrough.

The drive 41 and 48 forming a part of the motor n, so that it isunnecessary to journal this drive shaft 35-at any position inside thetransmission chamberi20. Furthermore, this structure is particularlyvaluable in that the motor, and all of the members attached to the driveshaft, can be removed from the enclosing shell thus permitting easyadjustment, repair, or replacement. Furthermore, the structure whereinthe motor -is partially positioned in the recess 24 is particularlyvaluable in that the motor unit I I can be made much smaller than wouldotherwise be the case, and .the drive shaft 35 can be made relativelyshort, thus not only effecting a saving in material but preventing thenecessity of auxiliary bearings for this shaft in the transmissionchamber 20.

shaft 35 is supported by bearings l6 as a unit;

Positioned in the chamber2|l is a transmission means, indicated ingeneral by the numeral 50, adapted to operatively connect the driveshaft 35 and a driven shaft 5| in such a manner that the speed ratiostherebetween can be readily changed. In Fig. 2 we have shown oneembodiment of such a transmission means which finds particularapplicability in the motor unit I 5. Certain types of variable speedtransmission means of the V-belt type require the use of spring meansfor compensating for'conditionsresulting when the speed ratio ischanged. Such a resilentirely dispensed with in the form of theinvention shown in Fig. 2.

We have shown the side wall 22 an opening 53 closed bya bearing suitablysecured thereto as by cap This bearing member includes alubricant-containing chamber 51 through which the driven shaft 5|extends. Bearings 58 and 59 are placed at opposite ends of this chamber51 and journal the driven shaft 5| which extends from a point exterior\of the enclosing shell l6 to a side the transmission chamber 20, butnot compZetely thereacross so that the inner end of this shaft isseparated from the side wall 2|. 6 The transmission means 56 disclosedincludes a variable-diameter pulley means of the adjustable V-typeattached to the drive shaft 35 and the numeral 62, hereinafter termed aprimary pulley means, and a secondary variable-diameter pulley means ofthe adjustable V'-type, indicated in general by the numeral 63 andattached to the driven shaft 5|, these pulley means being operativelyconnected by a belt means 64 which is preferably of the V-type.

Referring particularly to the primary pulley means 62, the preferredconstruction includes flange members 65 and 66 rotating with the shaftas including member 54 members 65 and 66 are frusto-conical in shape toprovide a V-shaped channel 68 in which the belt means 64 By moving theflange members toward each other the belt means 64 moves outward,thereby changing the effective diameter of the pulley means 62.

The flange member 65 point inflange member 86 is suitably secured to ormade other convenient position.v This countershaft 95 integral with thesleeve 15. carries a sprocket 96 which is connected to the The elementsforming the adjustment means sprocket 19 by a chain 91. So also, thecounter- 51 cooperate in moving the flange members 55 shaft carries asprocket 98 which is operatively 5 and 66 toward and away from eachother even connected to the sprocket 88 through'a chain 99. 5 while themotor is in operation. Thus, consider- The outer end of the countershaftcarries a hand ingthat the motor is rotating, the adjustment' wheel I88or other suitable means for-manually shaft II will normally bestationary. By turning or automatically turning this countershaft sothat this shaft through the medium of the adjustment the adjustmentmeans, 61 and 93 will be simulmember 12, the nut 18 is advanced alongthe taneously moved. The system is somade that in threaded portion ofthe shaft 1|, thereby moving when the effective diameter of one pulleymeans the sleeve relative to the sleeve 59 and'thereby is increased, theefiective diameter of the other changing the stance between the flangememis decreased. bers 65 and 56. To prevent rotation of the nut It hasoften been found desirable to make one 15 13 with the adjustment member12 it is usually of the pulley means of larger diameter than the 15desirable to provide some means for holding this other. T'hus, thepulley means 53 has been illusnut stationary. 1n the form shown, thismeans trated as being of much larger diameter than includes a rod 18asecured to the nut 18 and bent the pulley means 62. I to extend outwardbetween the sleeve 15 and the There is inevitably a slight stretch inthe belt 20 adjustment member 12. Theend of this rod carm ans, 6 afte tu t h been in p t n ries an eye 181) which is slidable on a pin 18c foralong period of time. It is thus Preferable extending inward from theside wall 22. The cup to Provide some adjustment means for adjusting 12is positioned entirely inside the transmissio e tension in t belt- S nadj s e t chamber 20 and may be mov d through th m means is also verydesirable in view of the fact dium of a sprocket 19 forming a part of acontrol hat when replacing one b l w h er. i is ,5 means so to behereinafter described. almost impossible t e e e ts of e ct y the Thepulley means 63 r d t th driv same length. In view of the fact that inthe shaft 5| is of somewhat similar construction and p r e e bodi entthe axes of the drive and includes flange members 8| and 82 cooperatingdriven shafts are'in fixed position, it is not usually 80 in forming a'V-shaped groove receiving th belt desirable to change the tension of thebelt by means 64. A sleeve 85 is carried by'the flange moving one or theother of these shafts, though member 8| and is suitably keyed to thedriven this can he done y extending the c n ews 5 shaft 5|, extending adistance therebeyond. The through Openings in the be r m mber 5 whichfree end of this sleeve is counterbored to receive are 8 in diameterthan the p Screws- 85 the t r r e of bearing 35, i outer race also, itis not desirable to utilize an idler for adbeing suitably secured-in thecounterbore of the lusting th tension of the belt. In h pr f rredsleeve. The inner race ofthis bearing is pressed embodiment thisvadjustment s e ected y onto an adjustment shaft 81, the outer -end ofchanging h r l iv p s i ns f he dju tment which is threaded and carriesa sprocket to form'-- means 61 3 wi h e pe t to the counter-shaft 4o inga part of the control means so. A nut 09 is T may be do by emp rarilyremoving 40 threaded to the adjustment shaft 81 and is carried one tchains and advancing. or retracting by the inner race of a ball bearing98, the outer corresponding adjustment means un he race of this ballbearing b i i d by a l desired tension is reachedafter which the chain9| telescoping with the sleeve 85 and carrying a is again interconnectedwith the 'countershaft 95..

4,5 flange member '82. Key means simila to that However, in thepreferred embodiment one of the ,45

previously described may be utilizedfor preventsprockets is ad-iustablym0 with respect to ing relative rotation between the sleeves 85 and itsthat Such movement of one adjusting 9L Means may also be provided rpreventing means relative to the other can be easily effected.

' rotation of the nut 89 with. the adjustment shaft In the .form shown(see 4) the sprocket 95 so 81, this means including a rod sliding on apin indudes hub including a plurality of ysimilar to the constructionpreviously described. ways formed therein and opening on the h when tsprocket 33 is turned, the anus tral bore. through. which 'the shaft 95extends.

ment shaft 81 journals in the bearing 85 and h shaft 95 carries keyway Akey is moves the nut as along this shaft. The nut as inserted in thekeyway l" and into any desired acts through the medium f thegbearmg' 9 tkeyway I82 of the sprocket 96, thus adjusting the 55 m the sleeve 9 andthus the fl ng member relative position of the sprocket and the counter-82. The structure interconnecting the adjust,- shafl and thus P9 movingthe adjust ment haft 31 and the'flang members and n ment means 61relative to'the adjustment means thus comprises an adjustment meansdesignated 98. The net effect is to adjust the tension in the in generalby the numeral 93. i belt El. 60

It is an important feature of the present in- The construction ShOWn in2 18.3150 9 vention, when using a transmission means such (many valuablein that it Permits replacement as m t t tg'simultaneously adjust thepulley of the belt means without dismantling the unit. means 62 and 53,the effective diameter of one Thus, the enclosing Shell 9 f etransmission 05 ulley. means being increased'while the effective n l6 prvides an elongated op n "I in the 6 diameter of the other pulley meansisdecreased. upp r w l thereof and n m l y closed by a cover This isaccomplished through the control means I08. When it is desired to rep cethe belt means which comprises any suitable means for 'simulthis coveris removed, and the chains connected taneously operating the adjustingmeans 91 and to the sprockets 19 and 88 are temporarily re- 70 93. Inthe bodiment of the invention illusmoved. The corresponding adjustmentmeans 51 70 trated, see particularly Fig. 3, this control means and 98are then turned relative to each other so is shown as being in the formof a countershaft as to permit the belt means to slide inward in 95which may be journalled in the side-walls 8| one pulley asumcientdistance so that it can and 22 to extend across the transmissionehamberbe removed from the other pulley. Due .to the 20 at a position above thebelt means, or at any fact that the drive shaft 35 and the driven shaft1,

removing it through the move the belt, sliding this belt through thespace beyond the ends of these respective shafts and opening I01.

It is often desirable to be able to secure speed ratios substantiallygreater than that possiblewith a single transmission unit, such as shownThus, we have found it desirable to combine two or more of thesetransmission units, and control all of the units by a single controlmeans. Such a system may include several sets of variable-diameterpulleys in the same enclosing structure, but in the preferred embodimentwe prefer to utilize separate enclosing structures for each set. Thus,in Fig. l we have illustrated a motor unit I5 such aspreviously'described, and including the transmission unit I6, inconjunction with an auxiliary transmission unit indicated by the numeralIIO. iliary transmission unit lar to that shown in detail in Fig. 2.-Wlth such a combination the driven shaft 5| of the transmission unit I6is directly or indirectly connected to a shaft III of the transmissionunit IIO so that the shafts 5| and III comprise a counter shaft means. I

The transmission unit H0 is shown as comprising a variable-diameterpulley means of the adjustable V-type II2 carried by the shaft III andconnected by a belt II3 to a variable-diameter pulley means indicated bythe numeral H4 and operatively connected to a driven-shaft I I5.

Each of these pulley means includes an adjuste ment means such aspreviously described so that the entire combination includes fouradjustment means. It is desirable to provide-a unitary control for theseadjustment means, and for this purpose we have shown the countershaft 95as simultaneously changed, thus permitting speed, variations as high as100 to 1.

It should be understood that a separate consingle control means, is newregardless of the details of the particular transmission means-utilized. Thus, assuming that each transmission unit has a separateregulating means for changing the speed relationships between itsshafts,

" ated type well knownthe invention includes the series connection ofsuch transmission units with a control means for operatively connectingthe regulating means of each transmission .unit. Such transmissionunits, for instance, might be of the spring-actuin the art and whereinthe flanges of one or more pulley. means are moved toward and awayfrom-each other by resilient Thus, the flange means or wherein thedistance between the shafts is changed by resilient means.

In Figs. 5 to 7 we have illustrated an alternative form of the inventionincluding a floating countershaft I24. Here both transmission unitsmaybe positioned in the same enclosing structure I25.

A motor I26 is utilized, the shaft of this motor carrying a pulley meansI21 of the adjustable V-type similar to that disclosed in Fig. 2 andincluding flange members I28 and I29. The flange member I28 is moved byan adjustment means I30 similar to the adjustment means 61 previouslydescribed, the adjustment shaft being indicated by the numeral I3Iextending through the casing to carry a hand wheel I32 through whichcontrol may be effected. A sprocket I33 on the adjustment shaftisconnected by a suitable chain to a sprocket I34 mounted on acountershaft I35 suitably journalled in the shell.

A belt means I36 operatively connects the pulley means I21 to a pulleymeans I38 mounted on a floating countershaft I40, this shaftbeinghollow. This pulley means I38 comprises flange members MI and 142, theformer being connected by pins I43 extending through elongated slots I4401 the countershaft I to a ring I45 positioned therein. This ring issuitably fixed to a control shaft I46, there being bearings I41 and I48between the control shaft and the countershaft I40. The flange memberI42 is carried by the countershaft I40 so. that if the control shaft I46is moved axially the flange member MI is carried therewith to adjust thepulley means I38. This axial movement takes place thrdugh anadjustmentmeans I50 shown as including a sprocket -a sprocket I52 carried by theshaft I35. This sprocket I5I is suitably journalled by a hearing I54 ina floating base I55. Further, this sprocket is threaded to receive anadjustment shaft I51 which is kept from rotating by a squared pin I58extending into the end thereof, this pin being suitably secured to thefloating base I55. The result is that when the sprocket .I 5I is turnedthe adjustment shaft I51 is advanced axially. This axial movement istransmitted to thecontrol shaft I46 through a thrust bearing I59 carriedin a cup I60 forming a part of the adjustment shaft I51. v

The floating countershaft I40 also carries a controlmember I46 whichcarries a ring I68.

.This ring may ber I61 through pins I69 extending through be connectedto the flange memelongated openings I10 of the countershaft I40.

members HI and I61 aresimultaneously adjusted.

The pulley means I is operatively connected by a belt means I16 .to apulley means I11 which may be identical with the pulley means 63,previously described. An adjustment means I18 is provided for movingthe. outermost flange member when a sprocket I19 corresponding to thesprocket 88 is turned. This" sprocket!" is connected by a chain to asprocket I carried by the shaft I35. Thus,as the hand wheel I35 isturned, the pulley means I21, I38, I65, and I11 are simultaneousiyadjusted; It should not be understood, however, that we are limited tothe exact mech- ISI connected by a chain to ,pulley means I65 includinga flange member I66 bearings I85 and is too great pression springdeveloped in shaft; means for mounting said driven shaft in anism shownfor securing justment.

The floating countershaft I48 this simultaneous adis journalled by I86carried in a hub I81. This hub 'is supported on the upper end of one legof a U-shaped'support I88, the other end of this the floating base I55.

I83 of a horizontal extend- The opposite end of this support member inturn carries bifurcations shaft I86 suitably journalled the base .of

I85 which retain a in lugs I81 extending upward from the enclosingstructure.

The result of this structure is that the countershaft I48 floats s as tobe movable either hori-' zontally or vertic lly. This movement can thusbe used to maintain the proper tension in the belts, and in the absenceof other elements the tension will be substantially equalized betweenthe belt means I36 and I16. Usually, however, the weight of thecountershaft and its attached pulley means, together with to thusprovide the proper tension It is thus possible to use a com- I88extending between the horizontal support I84 and the base of theenclosingv structure to support a portion of the weight of thecountershaft I40 and its attached means. The size of this spring thusregulates the tension the belt means. Of course, if the adjustment.

" shaft and its attached structure are not sufflcient and includingdrive shaft, one of said ically interconnecting said changing thetransmitted by desired tension, it is possible to make the spring I88 atension spring. So also, it is possible to utilize a spring I88 which isof suflicient strength to support the entire weight of to maintain thethe countershaft andits attached elements, thus\ using the excesscompression of the spring to control the tension of the belt means.

With a speed reduction system in Fig. 5, the torque transmitted by thebelt means I16 is of course much greater than the torque the belt meansI 36. For this reason it is often desirable to maintain the tensions inthese belt means at different values, it being usually desirable tomaintain the belt means I16 tighter than the belt means I36. Taccomplish this result, we may utilize a tension spring 288 extendingbetween the horizontal support I88 and the U-shaped support I88, as bestshown in Fig. 6. This spring tends to move the floating countershaftII-leftward as viewed in Fig. 6, thus increasing the tension of the beltmeans I16.

While we have shown our invention in conjunction with an electric motor,it is clear that the novelty of our system is not limited thereto. Thetransmission means herein disclosed are in themselves novel regardlessof the driven and drive members.

Various modifications and changes may be made in the structure partingfrom the spirit of the invention.

We claim as our invention:

1. In combination: a

of the adjustable V-type on said drive shaft flange members rotatingwith said movable toward and away from the other to change theeii'ective diameter of said pulley means; a primary adjustment distancetherebetween when said is operated; a driv primary adjustment means I92which is J'ourthe support I88,

shown as shown herein shown without de-- I drive means including a driveshaft; a variable-diameter pulley means flange members being pulley tomove radially in said means including means to moveradially said drivensaid mountdriven shaft any directional component of said vertical andhorizontal movements; a

variable-diameter V-type on said driven shaft and pulley means of theadjustable including flange members one of which is movable toward andaway from the other ameter of this pulley ment means mechanically saidpulley means on said flange members of to change the effective dimeans;a secondary adjustinterconnecting said driven shaft to change theeffective diameter of this pulley means; a

both of said pulley means;

belt means extending around and a control means operatively connectingsaid primary and secondary adjustment means for simultaneously movingthe same.

2. In combination: pulley means of the a drive shaft; a primary.adjustable V-type on said drive shaft; a countershaft; means forrotatably mounting said countershaft in ship; a secondary pulley meansV-type on said countershaft; a belt means confloating relationof theadjustable necting said primary and secondary pulley means;

a tertiary pulley means 7 said secondary pulley means and adjustableV-type, said tertiary pulley means operatively connected to being of thebeing mounted on said countershaft; a driven shaft; a quaternary pulleymeans of the adjustable V-type connected to said driven shaft, each ofsaid pulley means members one of which away from the other; a

including a pair of flange is movable toward and, belt means connectingsaid tertiary and quaternary pulley means; an

adjustment means individually associated-with each of said pulleyinterconnecting said flange means and mechanically members of itscorresponding pulley means; and control means operatively connected tosaid adjustment means associated with said primary, secondary, tertiary,and

quaternary pulley means operating all of these 8. In combination: meansof the for simultaneously adjustment means. a drive shaft; a primaryadjustable V-type on said drive shaft; a driven shaft; 9. countershaft;bearing means for said countershaft; linkage means carrying said bearingmeans to journal said countershaft in floating relationship with saiddrive and driven 'shafts;

a secondary pulley means of the adjustable V-type on said countershaft;a belt means connecting said primary and said secondary pulley means;

operatively connected means pulley means and being of the said tertiarypulley means ulley adjustable V-type, being mounted on saidcountershaft; a quaternary pulley means of the an adjustable V-typeconnected to said driven shaft, each of said pulley means including apair of flange members one of other; a

and away from the which is movable toward belt means connecting saidtertiary and quaternary pulley means; 5

an adjustment means individually associated with each of said pulleymeans and mechanically interconnecting said flange members of itscorresponding pulley means; and control means operatively connected tosaid adjustment means associated with said primary, quaternary pulleyoperating all of these 4. In combination: pulley means of the means fortertiary, and simultaneously adjustment means.

a drive shaft; a primary adjustable v-type on said 15 secondary,

drive shaft; a driven shaft; a counter-shaft; bear ing means for saidcountershaft; a pair of supmeans associated with each of said pulleysand mechanically interconnecting the flange members of each of saidvariable-diameter pulleys; means I a second belt means operativelyconnecting said tertiary and quaternary pulleys; and control meansoperatively associated with said adjustment means for operating driveand driven shafts to maintain the tension in said belt means as saidcontrol means is actuated.

7. In combination: a drive shaft adapted to be driven by a source ofpower; a power receiving shaft; means for supporting said powerreceiving shaft in floating relation with respect to said drive shaft,said means including means for mounting said power receiving shaft tomove tively connecting said pulley means; ment means individuallyassociated with each of said pulley means and mechanicallyinterconnecting said flange members of its corresponding operating eachof said adjustment means to vary of each of said pulley means, saidpower receiving shaft being permitted by said floating support tomaintain the tension in said belt means as said control means isactuated.

r'eceiving shaft, each of of the variable-diameter V-type having a pairof-flange members one of which is axially movable means and meansto' 70'operatlvely 1 days of the pair of flange members one of operatively conn11. In a variable speedtron device,

connecting said for urging said 7 section away from matically maintaininthe tension in said belt means as the effective diameters of said pulleymeans are varied. I

10. In a variable speed transmi on device, the combination of: a driveshaft adapted to be driven by a source of power; a power receivingshaft; means for supporting said power receiving shaft comprising asupporting arm sebeing pivoted to a base member.

movable relative to the other; and

the combination of: be driven by a source of ing shaft; a power deliveryshaft; supporting said power receiving shaft comprising a supporting armsecured relative thereto,

to said arm. said linkbeing pivoted to a base m said drive shaft;secondary pulley means-on said of pillpower receiving shaft, comprisinga pair variable-diameter- V-type; tertiary pulley means on said powerdelivery mary belt means connecting-said primary pulley means with oneof said pulleys of said secondary" pulley means; and secondary beltmeans connecting the other of said ondary pulley means'with saidmeans. w12. In a variable speed of: a drive pulleys of said sectertlary pulley.

shaft;

ceiving shaft, comprising a pair of pulleys of the eansvariable-diameter V-type; on said power delivery shaft;

primary pulley of said pulleys of said secondary secondary belt meansconnecting said pulleys of said secondary pulley means with saidtertiary pulley means; and

secondary pul ey said tertiary pulley means.

porting said power pivoted to said ember; primary pulley means on shaft;priof said pulleysof said secondary means connecting the othermean8inadi-' 13. In. a variable speed the combination of: a drive shaftadapted to be driven by a'source of power; a power receiving shaft; apower delivery shaft; means for supreceiving shaft comprising a pivotedto said arm, said link being pivo to a base member, and a springconnecting said arm and saidlink, primary pulley means on sai driveshaft; secondary pulley means on said power re shaft, comprising a orpulleys of the variable-diameter V-type, tertiary pulley means on saidpower delivery t; prisaid pulleys of said secondary and secondary beltmeans connectsaid secondary pulley means with said tertiary means.

- 14. 'In a variable speed transmiss on device, the combination of adrive shaft adaptedto be driven by a source of power;a power receivingshaft; a power delivery shaft; means for supporting said power receivingshaft comprising rting arm secured relative thereto, a link said arm,said link bein pivoted'tc spring connecting said shaft:

pulley means with one pulley means;

conne tin and secondary belt v of said pulleys of said secondary puileymeans with said tertiary pulley means.

tron" device, shaft adapted to be vertically, horizontally, or in anycombination gfflilvertical and horizontal movements; a primary CY shaft;a second ving shaft of means on-sald drive pulley means on said powerthe variable-diameter V-type having a pair of flange members one ofwhich is axially movable relative'to the other; and belt means'operatively connecting said pulley means.

CARL it.

JOHNSON.

on device,

